The key central defender missed Liverpool's 1-1 draw with
Manchester United on Sunday amid a disagreement over his international status
and he could be unavailable for the next month.

Matip last year announced he no longer wished to be
considered for selection by Cameroon and was not named in their Africa Cup of
Nations squad.

But the 25-year-old, who last played for Cameroon in
September 2015, did figure in a preliminary squad list.

In a statement a FIFA spokesperson said that Liverpool had
been directed to study article five of its rules.

It states that "a player who has been called up by his
association for one of its representative teams is, unless otherwise agreed,
not entitled to play for his club during the period for which he has been
released, plus an additional period of five days".

That means Liverpool could be without Matip until they play
Tottenham Hotspur on February 11 should Cameroon reach the Nations Cup final in
Libreville, Gabon.

In a statement on Sunday Liverpool said it was their view
"that the player should be available for club football during the period
of the competition and will continue to work for a speedy and unambiguous
resolution".

But the FIFA official warned: "FIFA also indicated that
any potential violation of the relevant rules would be the subject of an
investigation by its disciplinary commission."

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